While Solomon is a very wise man for several different reasons, as for if he is the wisest I don't think so. Solomon lived for hundreds of years, witnessed countless acts of violence, love, and compassion. King Solomon created an entire religion and through is people and airs spread that religion that is still known today. So why is Solomon not the wisest man who ever lived?
Because Enoch is the wisest man whom ever lived. Enoch was taken into the heavens with the angels / higher beings. Enoch from there got to converse with the highest in this universe. Some say Enoch is the single man who came back from the stars just long enough to teach us what we currently learn in school. Everything we learn in school. From math, to astronomy Enoch gave us the information. Some even say Enoch gave the instruction for the building of the Pyramids using small boxes which reverse the polarity of Earths gravity. Meaning that they could basically create a vacuum around an object and make it float to its final destination.
The bottom line is Enoch is the wisest man who ever lived. I am personally very inspired by Enoch, and look forward to finding more hidden information on him like the Dead Sea Scrolls. Great question by the way!